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Characteristics of primary air condensation in indirect evaporative cooler: Theoretical analysis and visualized validation

机译：间接蒸发式冷却器中一次空气冷凝的特征：理论分析和可视化验证

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摘要

In hot and humid regions, an indirect evaporative cooler (IEC) could be utilized to pre-cool and pre-dehumidify fresh air by capturing the cooling potential of exhaust air from indoor air-conditioned space. The condensate retained on the surfaces of primary air channels has a profound impact on the heat transfer performance of the IEC. Although the studies of IEC considering condensation have received extensive attention recently, the micro scale condensation mechanism has seldom been addressed. In this paper, the analytical model and experimental investigation on the condensation heat transfer of the IEC under different dehumidifying conditions are presented based on visualized observation and measured data. An image processing method is developed to determine the area ratios of dropwise condensation (DWC) and filmwise condensation (FWC) on the plate surface. Results show that, with the increase of inlet primary air temperature, the area ratios of the DWC and FWC remain relatively stable at 0.4 and 0.6 respectively, while the overall heat flux slightly increases. The relative humidity of primary air can significantly influence the overall heat flux on the plate surface, as the increased FWC under high relative humidity results in a decreased growth rate of heat transfer coefficient. Higher air velocity can greatly improve the condensation heat transfer performance by enlarging the area ratio of the DWC. The results of this study enlighten the condensation heat transfer characteristics of primary air on the plate surface of the IEC, providing references for heat transfer enhancements of air-conditioning systems by promoting dmpwise condensation.
机译：在炎热和潮湿的地区，可以利用间接蒸发冷却器（IEC）通过捕获来自室内空调空间的废气的冷却潜能来对新鲜空气进行预冷却和预除湿。保留在主要空气通道表面上的冷凝物对IEC的传热性能产生深远影响。尽管最近考虑凝结的IEC研究受到广泛关注，但很少涉及微型凝结机理。本文基于可视化观测和实测数据，给出了不同除湿条件下IEC冷凝水传热的解析模型和实验研究。开发了一种图像处理方法来确定板表面上的逐滴冷凝（DWC）和薄膜冷凝（FWC）的面积比。结果表明，随着入口一次空气温度的升高，DWC和FWC的面积比分别保持相对稳定，分别为0.4和0.6，而总热通量则略有增加。一次空气的相对湿度会显着影响板表面的总体热通量，因为在较高的相对湿度下增加的FWC会导致传热系数的增长率降低。更高的风速可以通过增大DWC的面积比来大大提高冷凝水的传热性能。这项研究的结果启发了IEC板表面上一次空气的冷凝传热特性，为通过促进dmpwise冷凝增强空调系统的传热提供了参考。

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